# GM Pro AF vs InchMMark

The clearest difference is update cadence: InchMMark at weekly against GM Pro AF's every 3 weeks. InchMMark also leads on iOS requirement (13.0 vs 15.0). On price, ads, in-app purchases and device support there is nothing between them.

Both are free to download. Neither carries in-app purchases, so what you see is what you pay.

GM Pro AF ships an update every 3 weeks, InchMMark weekly. The most recent releases landed on October 20, 2026 and October 25, 2026 respectively.

## The numbers

| Metric | GM Pro AF | InchMMark |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.5 (2 ratings)](https://appshunter.io/ios/app/gm-pro-af/id6474267202/reviews)** | — |
| Number of ratings | **2** | — |
| In-app purchases | No | No |
| Ads | No | No |
| Update frequency | Every 3 weeks | **Weekly** |
| Monetization | Free | — |
| Size | 53 MB | 17 MB |
| Requires iOS | 15.0 | **13.0** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Gorilla Tools, Inc](https://appshunter.io/developer/1480564474) | [Kevin Holzmeyer](https://appshunter.io/developer/1884356851) |

## What reviewers say

### GM Pro AF

[App page](https://appshunter.io/ios/app/gm-pro-af/id6474267202)

This app instantly configures running parameters for machining cutters, calculating RPM, IPM, SFM, and Chimp-Loads for various materials. It provides confidence and swagger for shop floor operations and allows sharing of findings.

**Highlights:** Instant configuration of running parameters, Calculates RPM, IPM, SFM, and Chimp-Loads, Supports a wide variety of machining materials, Quick calculations without lengthy questionnaires, Share machining findings

**Features:** Vision Pro support

**In-app purchases:** none


### InchMMark

[App page](https://appshunter.io/ios/app/inchmmark/id6760417609)

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases:** none


## Frequently asked questions

### Is GM Pro AF free?

GM Pro AF is free to download, with no in-app purchases.

### Is InchMMark free?

InchMMark is free to download, with no in-app purchases.

### Do GM Pro AF or InchMMark have ads?

Neither GM Pro AF nor InchMMark shows ads.

### Which is updated more often, GM Pro AF or InchMMark?

GM Pro AF ships an update every 3 weeks, and InchMMark weekly. Most recently, GM Pro AF was updated on October 20, 2026 and InchMMark on October 25, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*